I have a cranberry hibiscus that I put in this year. It started out 1 G.
pot size, and is now close to 6 feet tall. It has spread nicely, has a good
overall shape, and seems very healthy.

The only problem I have--it won't bloom. Not once over the past few months
has it set any blooms. It is planted in good soil and on a few occasions
I've used a bloom booster fertilizer on it.

Can anyone recommend a way to entice this plant to bloom?

Tony